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Isère (38)

Agnin: geology and natural hazards

What public services say about the ground beneath the commune (population 1,245) and the hazards it faces: natural disasters, earthquakes, radon, cavities, clays, groundwater and rocks.

Hazard names and other data are quoted as their producers publish them, in French.

Explore the commune on the map

Agnin at a glance

Seismic zone
3 of 5 (moderate)
Radon potential
Category 1 of 3 (low potential)
Recognised natural disasters
12 since 1982
Underground cavities recorded
None
Ground movements recorded
1
Risk prevention plans
1

Hazards listed by the French State

Natural and technological hazards to which the commune is exposed, according to the national GASPAR database.

  • Inondation: par une crue à débordement lent de cours d’eau, par une crue torrentielle ou à montée rapide de cours d’eau, par ruissellement et coulée de boue, par remontées de nappes naturelles
  • Mouvement de terrain: glissement de terrain
  • Séisme
  • Transport de marchandises dangereuses

Recognised natural disasters

12 events recognised as a natural disaster by ministerial order since 1982.

  • Inondations et/ou coulées de boue: 10
  • Sécheresse: 2
  • Glissement de terrain: 1
  • Mouvement de terrain: 1
  • Tempête: 1

  1. Sécheresse

    Event from 01/04/2022 to 30/06/2022, order published in the Journal officiel on 03/05/2023.

  2. Sécheresse

    Event from 01/07/2020 to 30/09/2020, order published in the Journal officiel on 06/06/2021.

  3. Inondations et/ou coulées de boue

    Event from 08/12/2000 to 09/12/2000, order published in the Journal officiel on 14/06/2001.

  4. Inondations et/ou coulées de boue

    Event from 10/06/2000 to 11/06/2000, order published in the Journal officiel on 22/11/2000.

  5. Inondations et/ou coulées de boue

    Event on 25/10/1999, order published in the Journal officiel on 19/03/2000.

  6. Inondations et/ou coulées de boue

    Event from 22/10/1999 to 23/10/1999, order published in the Journal officiel on 19/03/2000.

  7. Inondations et/ou coulées de boue

    Event from 05/10/1993 to 10/10/1993, order published in the Journal officiel on 24/10/1993.

  8. Inondations et/ou coulées de boue

    Event from 05/10/1987 to 06/10/1987, order published in the Journal officiel on 20/02/1988.

  9. Glissement de terrain, Inondations et/ou coulées de boue

    Event from 30/04/1983 to 01/05/1983, order published in the Journal officiel on 24/06/1983.

  10. Inondations et/ou coulées de boue, Mouvement de terrain

    Event from 24/04/1983 to 31/05/1983, order published in the Journal officiel on 26/07/1983.

  11. Inondations et/ou coulées de boue

    Event from 26/11/1982 to 27/11/1982, order published in the Journal officiel on 26/12/1982.

  12. Inondations et/ou coulées de boue, Tempête

    Event from 06/11/1982 to 10/11/1982, order published in the Journal officiel on 19/11/1982.

Earthquakes and radon

Seismic zone

Zone 3 of 5: moderate. This regulatory zoning, in force since 2011, sets the rules for earthquake-resistant construction.

Radon potential

Category 1 of 3: low potential. The geological formations have the lowest uranium content. Radon is a naturally occurring radioactive gas that can build up in poorly ventilated rooms.

Beneath the town hall

What BRGM maps say at the town hall. They describe that single point: elsewhere in the commune, the ground may be quite different.

  • Shrink-swell clays

  • Rising groundwater

  • Underground cavities

  • Ground movements

  • Earthquakes

  • Nature of the ground

Cavities and ground movements

Recorded across the whole commune by BRGM, in its national databases of underground cavities and ground movements.

No underground cavity recorded (quarries, cellars, military works, natural cavities…).

1 ground movement recorded (landslides, rockfalls, collapses, mudflows…).

See cavities and ground movements on the map

Risk prevention plans

  • PPR - Agnin

    Natural risk prevention plan.

The zoning and regulations of each plan, which may prohibit or restrict building, can be consulted at the town hall and on Géorisques.

Nearby communes

Sources and limitations

Listed hazards, natural disasters, seismic zoning, radon potential, cavities, ground movements and prevention plans: Géorisques, published by the French ministry for the ecological transition, under Licence Ouverte Etalab 2.0, data accessed on 02/11/2026. Summary beneath the town hall: BRGM map services, queried when the page is displayed. List of communes and populations: API Découpage administratif (geo.api.gouv.fr), d’après le code officiel géographique de l’Insee, version of 30/10/2026.

This information reflects the state of knowledge at the scale of the commune or of a single point. It replaces neither a soil survey nor the official risk statement (état des risques) required for a sale or a rental, which is drawn up on the official French government service.